.header{
    height: 75px;
    overflow: hidden;
}
.header .logo{
    float: left;
    margin-top: 14px;
    height: 44px;
}
.header .nav{
    float: right;
  margin-top:20px;
}
.header .nav li{
    display: inline;
}
.header .nav li a{
    color:black;
    display: inline-block;
    padding-left: 10px;
    line-height: 33px;
    text-decoration: none;
    padding-right: 10px;
}
.header .nav li a:hover{
    font-weight: 700;
    background-color: black;
    border-radius: 32px;
    color:black;
    padding-right: 10px;
    
}
body{
    width: 1080px; 
    margin: auto;
    color: rgb(73, 53, 57);
    padding-top: 90px;
    background-image: url(../images/熊猫.jpg);
    background-repeat: no-repeat;
}

h2,h3,h5{
    text-align: center;
}
p{
    text-align: center;
    text-indent: 2em;
}